Strainer for milk or other liquids.



K. W. HEYMAN.

STRAINER r011 MILK OR OTHER LIQUIDS.

APPLICATION FILED DBO. 9, 1911.

1,035,790. Patented Aug. 13,1912.

Inventor:

mmuwfl w W Atty UNITED STATES PATENT OFFICE.

KNUT WALDEMAR HEYMAN, 0F SKOGSTORP, TUMBA, SWEDEN.

STRAINER FOR MILK OR OTHER LIQUIDS.

To all whom it may concern:

Be it known that I, KNU'r WVALDEMAR HEYMAN, a subject of the King ofSweden, and resident of Skogstorp, Tumba. in the Kingdom of Sweden,estate owner, have invented certain new and useful Improvements inStrainers for Milk or other Liquids, of which the following is aspecification, reference being made to the accompanying drawing.

My invention relates to an improved liquid strainer, and is particularlyadapted for use as a milk strainer.

The principal object of the invention is to provide a thoroughlysanitary strainer, which is simply constructed and may be easilyassembled and disassembled, danger of infection being obviated byeliminating all necessity for manual contact, during the strainingoperation, with any of the parts over or through which the liquidpasses.

In the accompanying drawing is shown, by way of example, a milk strainercarried out according to this invention, Figure 1 is a vertical sectionof the strainer, while Fig. 2 is a horizontal section of the same online AB of Fig. 1. Figs. 3 and 4 are a vertical section and a top planview, re spectively, of a modified detail.

The funnel 1 forms a shoulder 2 against which the filtering element 3,consisting of a layer of a suitable filtering material, for instancecotton wool wad, placed between two straining plates, is kept pressed bymeans of a member 4 in the shape of a bell or cap, said member beingsituated above the filtering element. The member 1 is acted upon by around disk 5 on a spindle 6 which is placed centrally within the funnel1 and tapers downward so as to form a point. This spindle passes downthrough central holes in "the cap 4. and the filtering element 3. Thehole in the latter must accurately correspend, in shape as well as insize, to the part of the spindle within the same, so that no milk canpass down through this hole. The part of the spindle surrounded by thefiltering element should to this end be conical; it is thereforepreferred that the tapering of the spindle commences above the filteringelement. In the upper part of the funnel may be placed a coarse strainer7 having a central hole for the spindle 6. As will be seen, theuppermost part of the spindle 6, which part serves as a handle inperforming Specification of Letters Patent.

Application filed December 9, 1911.

Patented Aug. 13, 1912. Serial No. 664,787.

an operation hereinafter described, is located above the upper edge ofthe funnel 1, so that the milk in the funnel cannot come into contactwith the said part of the spindle.

The disk 5, which is firmly attached to the spindle, is pressed by meansof a bow 8, located above the upper edge of the funnel 1 and acting onthe upper end of the spindle, against the upper side of the cap 4, whichthus keeps the filtering element 3 pressed against its abutment orshoulder 2. The bow 8 is hinged at its one end to the funnel while theother end thereof is detachably connected to the funnel in any suitablemanner, for instance by a threaded swingable bolt 9 and a thumb nut 10,as shown. \Vhen the thumb nut has been loosened and the bolt 9 and thebow 8 have been swung on their pivots, the parts within the funnel mayeasily be removed. As clearly appears, the milk in the funnel cannotcome into contact with the how 8, which must be touched by the hands,when the filtering element 3 and the cap 4t are inserted into thefunnel. The part of the cap 4: which is just beneath the disk 5 isprovided with apertures 11, corresponding apertures 12 being provided inthe disk 5. By turning the spindle 6, to which end a pin 13 passedthrough the spindle is actuated, the supply of milk to the filteringelement 3 may-as will easily be seen-be regulated so as to be kept at apractically constant size, corresponding to the straining etl'ect neededin different cases.

In the modification shown in Figs. 3 and 4, wings 14 extending from ahub 15 mounted on the spindle 6, have been substituted for the disk 5provided with the apertures 12, as shown in Figs. 1 and 2. This device,obviously, acts in the same way as the corresponding device in Figs. 1and 2 both as regards the securing of the filter ng element and theregulation of the supply of milk to said element.

When the milk strainer is to be used, the filtering element 3 and thecap at are insorted into the same thereby that the pointed end of thespindle 6 is passed through the central holes in the said parts, so thatthe latter are carried by the spindle, which is held by the hand at itsother end. Thereupon the parts 3 and 4: are inserted into the funnel 1by means of the spindle 6, which is still held by the hand at the said(upper) end only, while the funnel is held in an inclined position,whereupon the bow 8 is clamped in position above the spindle. By thismeans the disk 5 is pressed against the cap 4, so that the filteringelement 3 is pressed against the shoulder 2, while the tapering part ofthe spindle is caused to bear on the wall of the central hole in thefiltering element. It is obvious that before the said operation isperformed the parts 1 to 7, inclusive, must be thoroughly cleansed andas much as possible free from bacteria. It is easily seen that duringthis operation none of the surfaces which are in contact with the milkduring the straining, will be touched by the hands of the personperforming the said operation so that a transfer of infections mattersto the milk by such contact is prevented as much as possible. Moreover,inasmuch as each surface element, even the smallest one, is easilyaccessible for cleansing so that all remainders of milk which becomesour can be effectually removed and the supply of milk to the filteringelement can be regulated as required, it will be seen that a milkstrainer constructed according to this invention will be well adapt-edto accomplish its purpose.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a liquid strainer, the combination with the casing, of a filteringmedium supported transversely therein, apertured means exerting pressureon said filtering medium to retain the same in position, and meanswhereby the size of the apertures in said first named means may bevaried to regulate the quantity of liquid passing to said filteringmedium.

2. In a liquid strainer, the combination with the casing having asupport formed therein, of a filtering medium resting on said support,apertured means for exerting peripheral pressure on said medium andretaining the same on the support, and means for varying the size of theapertures in the first named means to regulate the quantity of liquidpassing therethrough to the filtering medium.

3. In a liquid strainer, the combination with the casing, of a filteringmedium supported therein, an apertured cover restingon said filteringmedium to retain the same in position, and means for varying the size ofthe apertures in said cover to regulate the quantity of liquid passingtherethrough to the filtering medium.

4. In a liquid strainer, the combination with the casing, of a filteringmedium supported therein, an apertured cover resting on said filteringmedium, a spindle passing through said cover and filtering medium,

and means carried by the spindle for varying the size of the aperturesin said cover to regulate the quantity of liquid passing therethrough tothe filtering medium.

5. In a liquid strainer, the combination with the casing, of a filteringmedium supported therein, an inverted substantially cup-shaped coverresting on said filtering medium, said cover being provided withapertures in its, base, a spindle passing through said cover andfiltering medium, and means carried by said spindle for varying the sizeof the apertures in said cover to regulate the quantity of liquidpassing therethrough to the filtering medium.

6. In a liquid strainer, the combination with the casing, of a filteringmedium supported therein, an apertured cover resting on said filteringmedium, a spindle passing through said cover and said filtering medium,means carried by said spindle for varying the size of the apertures insaid cover, and means for exerting pressure on one end of said spindleto force said first named means against the cover and retain thefiltering medium in position.

7. In a liquid strainer, the combination.

with the casing having a supporting shoulder formed therein, of afiltering medium resting transversely in the casing on said shoulder, aninverted substantially cupshaped cover resting peripherally on saidfiltering medium, said cover having apertures in its base, a conicalspindle passing through said cover and filtering medium, a plate carriedby said spindle and adapted to rest in contact with the apertured baseof the cover, means for revolving the spindle to vary the size of theapertures in the cover, and means adapted to exert pressure on one endof said spindle to force said plate against said cover and retain, thefiltering medium in position.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

KNUT NALDEMAR HEYMAN.

Witnesses:

H. B. OHLSSON, CARL TH. SUNDHOLM.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington. I). C. r

